Homosexuality is partly caused by a self-reinforcing mental process, especially considering the brain plasticity during teenage, which, associated with autosuggestion, becomes an irreversibly imprinted into early adulthood.
You’ve heard of people getting trapped into religious sects and sort of addicted to it, right? They never get out by themselves. Same thing here.

So, if you are at the beginning of your sexuality and you get trapped in a homosexual pattern, you may never get out of it. And yes, by the time you reach legal age, you will feel genuinely attracted to boys. But this attraction will be the result of an induced or imposed behavior, not a genetic determination of any sort.
In the past, a boy may have feel confused with his hormones and vaguely attracted to boys for a short time, but that was it. No Induced process was there to imprint his brain because of the barriers put in place by the Society, plus Religion forbade it, so, end of story. Now, here is an incredible concept: the Society was actually protecting its Citizen, can you believe it?

That’s one thing. The other thing is the chemical environment. It contains pollutants and hormones analogues, that decrease men’s hormonal load, which translates into hetero men with lower sperm count and in boys into small breast and small penises. A note here: fat is great to store all these pollutants, in addition to racial differences in sensitivity and fat storage. See how everything is linked?
Then, obviously, many more boys will start at the edges of hormonal un-differentiation and will become easy preys to the psychological mechanisms mentioned above.

Don’t say it’s not true, because even in girls you have the mirror mechanism: the constant decrease in the age in the fist menarche of girls. In the 18th century, It was relatively convenient for a girl to remain chaste until her 17eens, when she barely finished her puberty at 16, as opposed to now when many white girls start puberty in their 10th or 11th and are done by 12, and we ask them ‘not to think about it’ for the next 6-7 years, with raging hormones inside.
I asked a doctor why is that (for the girls) he said he doesn’t know, and nobody knows for sure. A combination of many chemicals, food, and behavior is likely.

So this is it. Beside the rare cases of true hormonal imbalance genetically determined and very rare, as for most genetic diseases, most cases of homosexuality are ‘induced’ by environment and behavior.
For the environment: pesticides/growth hormones are used to increase food production as well as many other chemicals from plastics, and female hormones are also directly released in the environment.
For the Behavior: well, the body is merchandised and you own your body right? so there is a market aperture here.
To resume it all: it’s MONEY.

So if you want, you can replace my long text with that small emoticon of a slightly hunchback man with a crook nose and who is rubbing his hands because of all the money he knows he’s gonna make.